1679280 - Connection refused to local network IMAP server after update to 78.5.0

Status: RESOLVED DUPLICATE of bug 1677806

(MailNews Core :: Networking: IMAP, defect)

Description

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Attachment: 2020-11-25_thunderbird_update_connection-error.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0

Steps to reproduce:

installed the update from version 78.4.3 to version 78.5.0 (on Windows 10 Pro), tried connecting to my local network IMAP server (account already existing before the update)

Actual results:

The connection to my IMAP server on the local network was refused ("Could not connect to server server2"). On the IMAP-server no connection-request was logged.
Connecting to the server over its IP-address (192.168.0.1) works, using its name 'server2' gives me the error. So it seems to me that the problem lies within the name resolution.

Reinstalling version 78.4.3 'fixes' the problem: the connection via hostname 'server2' works again. So it seems to me that this bug was introduced with the update to 78.5.0

Expected results:

the connection to the local network IMAP-server should have worked via its hostname

Comment 1

[Masatoshi Kimura [:emk]]

The Thunderbird counterpart of bug 1677806?

Comment 2

[Magnus Melin [:mkmelin]]

Thanks, :emk! Yes, sounds like it.